Study On Seismic Behavior Of Steel Frame Structure Based On Energy

The structural performance level is determined by inter-story drift and bearing capacity of structural member in Chinese code Technical Specification for Steel Structure of Tall Building.However,the structural performance level is determined by story drift and deformation of structural member in America code ASCE41-17.While investigating seismic behaviors of steel frame structures,the instantaneous damage and cumulative damage of steel frame structure within the earthquake could be further considered by adopting energy-based performance level index.In this paper,the study on seismic behaviors of steel frame structures is carried out based on energy-based performance level index.The main contents are as follows:1.The verification of simulation models as well as parameters of earthquake input energy and structural hysteretic energy.According to a 5-story steel frame structure,an elastic-plastic dynamic analysis model with plastic pins on column and beam members is established,and the corresponding elastic-plastic dynamic analysis is carried out on this model.A steel framework of this model is selected,and earthquake input energy and structural hysteretic energy on of that is obtained.In Perform-3D software,earthquake input energy is totally absorbed by viscous damping in elastic stage,while that is absorbed by viscous damping and hysteretic energy dissipation.The calculating results are compared with calculating results in other literatures,verifying the effectiveness of the models and the aforementioned parameters2.The calculating formula of energy-based performance level index is proposed to quantify such index.The performance level inter-story drift angle quantitative index is proposed based on the related Chinese code.The calculating formula of energy-based performance level index is proposed,which is defined as the ratio of the maximum cumulative plastic deformation energy of each story to inter-story cumulative plastic deformation energy under rare earthquake.Typical seismic waves are selected and applied on Benchmark multistory steel frame structures established in Perform-3D software.The maximum acceleration under each performance level is determined,based on the aforementioned quantitative index.The seismic excitation with the same value acceleration is applied.Based on the aforementioned formula,the energy-based performance level index is obtained.Furthermore,the energy-based quantitative index system of multistory steel frame structure is established.3.The comparison among energy-based performance level quantitative index.Hysteretic energy-based performance level index calculating formula is proposed.In this formula,the index is given as a ratio,while the molecular terms are the hysteretic energy of each story,and denominator terms are structural hysteretic energy under rare earthquake,based on the existing energy-based performance level index calculating formula in other literatures.The hysteretic energy-based quantitative index system of multistory steel frame structure is established.The comparison between this performance level quantitative index with that obtained from cumulative plastic deformation energy is carried out.By the aforementioned researches,the division standard,which is determined by inter-story drift by performance level quantitative index based on the existing Chinese code,is proposed.By elastic-plastic dynamic analysis on Benchmark multistory steel frame structure,the hysteretic energy-based quantitative index system based on cumulative plastic deformation energy,is established.